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Hi, I'm new to the forums so bear with me.... Recently as I was pulling away from the lights my xc70 lost all power beyond about 3000 rpm. When I pressed the pedal, nothing happened. I was able to slow down and continue, everything seemingly ok but just at lower revs. When I turned off the engine then started it again later it was normal. But it keeps happening that it won't rev beyond a certain point so seems generally good but has no 'poke'. Then when I turn it off and on again I can sit in neutral and rev as normal. I changed the fuel filter but this doesn't seem to have helped. Any ideas gratefully received. Thanks, Gareth.

Hi thanks for that. Got the codes today and it's giving 6805- (pressure converter: boost pressure control. control deviation negative). Which is Greek to me. Has anyone any experience of this? The car is quite sluggish at the moment and another thing has started to happen- when I accelerate from a standstill or uphill, there's sometimes a faint quite high-pitched noise and it's as though something is slipping. Related? Much obliged for any assistance here.

Hi, I'm new to the forums so bear with me.... Recently as I was pulling away from the lights my xc70 lost all power beyond about 3000 rpm. When I pressed the pedal, nothing happened. I was able to slow down and continue, everything seemingly ok but just at lower revs. When I turned off the engine then started it again later it was normal. But it keeps happening that it won't rev beyond a certain point so seems generally good but has no 'poke'. Then when I turn it off and on again I can sit in neutral and rev as normal. I changed the fuel filter but this doesn't seem to have helped. Any ideas gratefully received. Thanks, Gareth.

sounds like the fuel pressure sensor is failing it sits down the left hand side of the engine you at the front of the car, it gives information to your fuel pressure regulator ,just google this part,high pressure on that sensor so (danger) you must get the fuel pressure down first before you remove the sensor,so google how to do this it is found on you tube.

Thanks Daniel, I see you're in Glasgow- me too. I googled that part and they all seem to be in $. Phoned Partco and GSF and they don't do the part. They said phone Volvo- ouch. Car runs okay when it gets going but wouldn't pull your cap off and seems to be getting worse which is worrying. When they did the codes they said the turbo seemed ok because the pipes were bulging when it revved but there was another sound just after the revving which sounded like a burst of pressure release- something that he wasn't sure about but what might have been a dump of some sort.

Thanks Daniel, I see you're in Glasgow- me too. I googled that part and they all seem to be in $. Phoned Partco and GSF and they don't do the part. They said phone Volvo- ouch. Car runs okay when it gets going but wouldn't pull your cap off and seems to be getting worse which is worrying. When they did the codes they said the turbo seemed ok because the pipes were bulging when it revved but there was another sound just after the revving which sounded like a burst of pressure release- something that he wasn't sure about but what might have been a dump of some sort.

with a turbo ,on the turbo under the three bolts ,top of your turbo,under that cover is a diaphragm ,it may have pin holes or a split in it,it is called a turbo bypass valve, and it can have an oil leak there ,the other part that should be done is ,drain your inter cooler, there should be a drain plug on the bottom of your inter cooler.so what part of Glasgow are you in,try google a company called Parts for volvo, it is on line ,i take it you have checked that you do not have any vacuum hose leaks, check under the hose from your turbo in case you have a hole in the hose, put before you do anything to this car , the fact that ,you have two things, which seem to say trouble with your turbo,one being the hose pipes, are bulging can mean the turbo bypass is sticking ,or the hoses are weak,are you getting any white smoke out of your exhaust.and the sound you are getting can be a bearing in the shaft of your turbo, you need to do tests , that one code can be both ,turbo bypass valve or the fuel pressure sensor,but do not change that yet, as it sounds like the trouble is your turbo.

I'm in Scotstoun. Thanks for all this info- really appreciate you taking the time. So you reckon drain the intercooler and check the turbo in addition to the looking at the fuel pressure sensor? Looked at that website- looks good but could only find a regulator and lambda sensor- I assume they're not the job?

I'm in Scotstoun. Thanks for all this info- really appreciate you taking the time. So you reckon drain the intercooler and check the turbo in addition to the looking at the fuel pressure sensor? Looked at that website- looks good but could only find a regulator and lambda sensor- I assume they're not the job?

leave out the fuel pressure sensor the now,as checks must be done on your turbo,first thing to do is ,take off the hoses on your turbo, one hose should go from the turbo up to the air mass meter,should be on your air filter,take that off first,there should be an electrical connection half way down that hose,that is an agr sensor,common for a hole to be on the hose there, so check it,if there is i will tell you how to repair it,but note if any oil found,tell me,next is the hose from your turbo to the inter cooler, does it have a lot of oil coated on the inside,if it is you are going to have to drain your inter cooler,and flush it out,now go to the other side of the inter cooler that runs from the inter cooler to your throttle, and can coat the butterfly with oil not good , as will then need cleaned,with carb cleaner,so if oil found in that hose, then the trouble is your turbo,i took 4 hours to rebuild my turbo, cost in parts was from turbo rebuild in blackpool was £58 for the kit,and £4 for the turbo bypass valve,after doing that ,i took my volvo down to bristol from glassgow non stop for 6 hours 30 min at 70 mph i put £70 in fuel and used half of it,it is about 440 miles so car will run better after doing the rebuild.

Ok thanks for all the detailed advice. I took it to a garage and they agree with you that it's the turbo. They spoke to a turbo specialist and they reckon it's over boosting then the car goes into a kind of limp mode. Does that ring true with you? What are my options given that I know nothing about turbos or rebuilding them? Is there somewhere in Glasgow that rebuilds so that I can avoid paying a blind fortune for a new turbo (which is impossible anyway!)? Any advice greatly appreciated..

Ok thanks for all the detailed advice. I took it to a garage and they agree with you that it's the turbo. They spoke to a turbo specialist and they reckon it's over boosting then the car goes into a kind of limp mode. Does that ring true with you? What are my options given that I know nothing about turbos or rebuilding them? Is there somewhere in Glasgow that rebuilds so that I can avoid paying a blind fortune for a new turbo (which is impossible anyway!)? Any advice greatly appreciated..

Ok thanks for all the detailed advice. I took it to a garage and they agree with you that it's the turbo. They spoke to a turbo specialist and they reckon it's over boosting then the car goes into a kind of limp mode. Does that ring true with you? What are my options given that I know nothing about turbos or rebuilding them? Is there somewhere in Glasgow that rebuilds so that I can avoid paying a blind fortune for a new turbo (which is impossible anyway!)? Any advice greatly appreciated..

if it is over boosting as claimed by the garage,then you change ,the turbo bypass valve,just google turbo bypass valve for details,on my volvo 940 turbo it cost me Â£ 4 for a new one, from turbo rebuild in blackpool just google that place,but the fact you are getting the noise from your turbo,can show worn bearings ,as the turbine would be hitting the inside wall of the turbo,but did you check if you have oil coated over the inside of the turbo hoses,that will then show the need to rebuild the turbo, but do the (turbo bypass valve change) if it is over boosting, cheap and easy fix ,if it is just that,on top of your turbo is a round cover,held on by three bolts,remove the bolts,take off the cover,lift out your the diaphragm, it has a spring on it,just lift it out,note the colour of the top of it, as it can tell you high or low pressure turbo bypass valve,private message me, and i will give you my landmine number ,i can then talk you through ,what to do, as a check should be done, for a sticking waste-gate as the shaft can stick due to dirt and rust.just google turbo rebuild uk and you will see the place in blackpool,so what you should be doing is checking both the bypass valve and its cover, as the cover has a hose going to the wastegate valve,so if the bypass valve is leaking,or the hole for the hose to the wastegate valve is blocked by dirt or oil ,so what will then happen is it will over pressure as the wastegate valve is not opening, this is why i need to talk you through what to do, as it may be just a matter of doing some cleaning and not having to replace parts.